The last time was Manny Pacquiao, wo is supposed to face Spence but suddenly was replace by Ugas and obviously, Manny lost that fight already.
That was not the reason, whoever trained or coach Manny, he would not won in that fight because he said he has cramps on his legs that bothers him in the fight since he cannot use his quickness. Sometimes, boxers losses, it's just up to them how they'll recover from that loss.